Windows Server 2012 is arguably on of THE BEST OS's ever produced when it comes to server software. You have to get past the lack of a Start Button again, but the main GUI MS has provided right out of the box works very well.

If you are in the market for a HIGH-END server storage unit (and really... who's not these days...) NewEgg just built one, showing all the parts you need and how it looks when you are finished building it.